CN106483652A - View finder and camera head - Google Patents
View finder and camera head Download PDFInfo
- Publication number
- CN106483652A CN106483652A CN201610675888.8A CN201610675888A CN106483652A CN 106483652 A CN106483652 A CN 106483652A CN 201610675888 A CN201610675888 A CN 201610675888A CN 106483652 A CN106483652 A CN 106483652A
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- CN
- China
- Prior art keywords
- lens
- view finder
- optical system
- eyepiece group
- diopter
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B15/00—Optical objectives with means for varying the magnification
- G02B15/14—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
- G02B15/143—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having three groups only
- G02B15/1431—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having three groups only the first group being positive
- G02B15/143101—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having three groups only the first group being positive arranged +--
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B23/00—Telescopes, e.g. binoculars; Periscopes; Instruments for viewing the inside of hollow bodies; Viewfinders; Optical aiming or sighting devices
- G02B23/14—Viewfinders
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/04—Reversed telephoto objectives
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B25/00—Eyepieces; Magnifying glasses
- G02B25/001—Eyepieces
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/10—Beam splitting or combining systems
- G02B27/106—Beam splitting or combining systems for splitting or combining a plurality of identical beams or images, e.g. image replication
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B13/00—Viewfinders; Focusing aids for cameras; Means for focusing for cameras; Autofocus systems for cameras
- G03B13/02—Viewfinders
- G03B13/06—Viewfinders with lenses with or without reflectors
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B13/00—Viewfinders; Focusing aids for cameras; Means for focusing for cameras; Autofocus systems for cameras
- G03B13/02—Viewfinders
- G03B13/06—Viewfinders with lenses with or without reflectors
- G03B13/08—Viewfinders with lenses with or without reflectors with reflected image of frame
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B17/00—Details of cameras or camera bodies; Accessories therefor
- G03B17/18—Signals indicating condition of a camera member or suitability of light
- G03B17/20—Signals indicating condition of a camera member or suitability of light visible in viewfinder
Abstract
The present invention provides a kind of amount of movement of suppression lens corresponding with diopter adjustment amount and is conducive to miniaturization, can realize the view finder of good optical property and possess the camera head of the view finder.View finder (1) is the view finder of the inverse Galilean type for possessing the objective lens (2) with negative power and the eyepiece group (3) with positive light coke towards viewpoint side successively from thing side.Objective lens (2) and eyepiece group (3) separate the lens separation that becomes most long in terms of air characteristic chamber length and configure in the viewing optical system from objective lens (2) to eyepiece group (3).Eyepiece group (3) is made up of the first lens (Lb1) with negative power, the second lens (Lb2) with positive light coke, the 3rd lens (Lb3) with negative power from thing side successively.When diopter is adjusted, the first lens (Lb1) and the 3rd lens (Lb3) are fixed, and the second lens (Lb2) are moved along optical axis direction.
Description
Technical field
The present invention relates to the view finder of the inverse Galilean type of diopter can be adjusted and possesses the camera head of the view finder.
Background technology
In the past, in the view finder of camera etc., use example is such as described in Patent Document 1, from thing side towards viewpoint
Side is configured with the view finder of the inverse Galilean type of the objective lens with negative power, eyepiece group with positive light coke successively.
As the mode that the diopter of view finder is adjusted, it is known to carry out diopter by making eyepiece group move along optical axis direction
The mode of adjustment.For example, the view finder that Alba reaches formula is recorded in patent document 2, which has as eyepiece and plays work(
The positive lens that can and move along optical axis direction when diopter is adjusted.
Citation
Patent document 1：TOHKEMY 2012-42569 publication
Patent document 2：TOHKEMY 2001-311982 publication
Content of the invention
Invention problem to be solved
The miniaturization of the camera heads such as camera is constantly in progress, and view finder is also sought compactly to constitute.Therefore, move lens
Dynamic and carry out, in the view finder of diopter adjustment, seeking the amount of movement of lens when suppressing diopter to adjust.On the other hand, also have and think
Moderately to guarantee the such expectation of larger diopter adjustment amount.
However, due to inverse Galilean type view finder according to the size on required optical axis direction, multiplying power and substantially determine
The focal length of each lens group, therefore, when carrying out diopter and adjusting, also determines and diopter adjustment amount moving integrally eyepiece group
Corresponding amount of movement.
Patent document 1 is silent on the concrete grammar with regard to diopter adjustment.In the optical system described in patent document 1
In, eyepiece group is made up of a piece of positive lens, configures half prism or half-reflecting mirror and make the visual field between objective lens and eyepiece group
The information of frame etc. is Chong Die with the observation picture formed by viewing optical system observing.Move eyepiece group in such optical system
When moving and diopter adjustment is carried out, due to needing to avoid and the speculum for being configured, the interference of prism, mesh therefore cannot be substantially ensured that
Microscope group movement space and make diopter adjustment amount be limited.
Optical system described in patent document 2 is to recognize the amount of movement of the lens for suppressing diopter adjustment and propose
, it is considered to if taking into account the big diopter adjustment amount of desired degree in recent years and compact structure, it cannot be said that be fully to inhibit
The amount of movement of lens corresponding with diopter adjustment amount.
The present invention is completed in view of the foregoing, its object is to provide one kind inhibit corresponding to diopter adjustment amount
The amount of movement of lens and be conducive to miniaturization, the view finder of good optical property can be realized and possess the view finder
Camera head.
Solution
The view finder of the present invention is the view finder of inverse Galilean type, and which possesses to have towards viewpoint side successively from thing side bears light
The objective lens of focal power and the eyepiece group with positive light coke, wherein, observation optical system till from objective lens to eyepiece group
Among the lens separation in terms of air characteristic chamber length in system, it is most long with the lens separation of eyepiece group to separate objective lens, eyepiece group
Successively by the first lens with negative power, the second lens with positive light coke and with negative power from thing side
The 3rd lens constitute, when diopter adjust, the first lens and the 3rd lens are fixed, the second lens along optical axis direction shifting
Dynamic.
In the view finder of the present invention, following conditionals (1)～(3), (1-1)～(3-1) is preferably met, in (1-2)
At least one：
0.05 ＜ fN/f3 ＜ 0.5 (1)
0.1 ＜ fN/f3 ＜ 0.4 (1-1)
0.15 ＜ fN/f3 ＜ 0.36 (1-2)
0.55 ＜ D/f2 ＜ 1.5 (2)
0.6 ＜ D/f2 ＜ 1 (2-1)
0.1 ＜ m f1/f3 ＜ 0.8 (3)
0.15 ＜ m f1/f3 ＜ 0.6 (3-1)
Wherein,
fN：The focal length of objective lens；
f1：The focal length of the first lens；
f3：The focal length of the 3rd lens；
f2：The focal length of the second lens；
D：From objective lens most by viewpoint side lens face to eyepiece group most by thing side lens face air change
Calculate length；
m：Diopter be -1 diopter in the state of viewing optical system angular magnification (angularmagnification).
In the view finder of the present invention, outside the light path of viewing optical system, it is also possible to possess with viewing optical system not
With optical system, possess the light path of the optical systems that this is different and viewing optical system between objective lens and eyepiece group
The light path segmental member of light path synthesis.Now, the different optical system is preferably had the lens and of positive light coke by two panels
The lens that piece has negative power are constituted.
The camera head of the present invention possesses the view finder of the present invention.
It should be noted that " possessing objective lens with negative power successively and with positive light from thing side towards viewpoint side
The eyepiece group of focal power " is comprising all situations that are continuous and discontinuously having inscape successively.
It should be noted that " lens " of above-mentioned " lens separation " refer to the lens substantially with focal power.
It should be noted that above-mentioned " by～constitute " represent actual situation, in addition to the inscape that enumerates,
Can be including the optical parameter beyond the lens such as lens substantially not with focal power, diaphragm, cloche, optical filter, lens
Flange, lens barrel etc..
It should be noted that the symbol of focal power of above-mentioned each lens group, the symbol of power of lens are including
It is to consider near axis area in the case of aspheric.
Invention effect
According to the present invention, in the view finder of inverse Galilean type, by eyepiece group successively by negative lens from thing side, just saturating
Mirror, negative lens are constituted, and are moved only the positive lens of eyepiece group when diopter is adjusted, are inhibited and diopter therefore, it is possible to provide one kind
The amount of movement of the corresponding lens of adjustment amount and be conducive to minimize, can realize good optical property view finder and tool
The camera head of the standby view finder.
Description of the drawings
Fig. 1 is the sectional view of the structure for illustrating the view finder involved by one embodiment of the present invention.
Fig. 2 is the sectional view of the structure of the viewing optical system of the view finder for illustrating embodiments of the invention 1.
Fig. 3 is the sectional view of the structure of the display optical system of the view finder for illustrating embodiments of the invention 1.
Fig. 4 is the sectional view of the structure of the viewing optical system of the view finder for illustrating embodiments of the invention 2.
Fig. 5 is the sectional view of the structure of the viewing optical system of the view finder for illustrating embodiments of the invention 3.
Fig. 6 is the sectional view of the structure of the display optical system of the view finder for illustrating embodiments of the invention 3.
Fig. 7 is the sectional view of the structure of the viewing optical system of the view finder for illustrating embodiments of the invention 4.
Fig. 8 is the sectional view of the structure of the display optical system of the view finder for illustrating embodiments of the invention 4.
Fig. 9 is each aberration diagram of the viewing optical system of the view finder of embodiments of the invention 1, from illustrating ball from left to right successively
Surface aberration, astigmatism, distortion aberration, ratio chromatism,.
Figure 10 is each aberration diagram of the viewing optical system of the view finder of embodiments of the invention 2, from illustrating successively from left to right
Spherical aberration, astigmatism, distortion aberration, ratio chromatism,.
Figure 11 is each aberration diagram of the viewing optical system of the view finder of embodiments of the invention 3, from illustrating successively from left to right
Spherical aberration, astigmatism, distortion aberration, ratio chromatism,.
Figure 12 is each aberration diagram of the viewing optical system of the view finder of embodiments of the invention 4, from illustrating successively from left to right
Spherical aberration, astigmatism, distortion aberration, ratio chromatism,.
Figure 13 is the stereogram of the Sketch of the rear side for illustrating the camera head involved by one embodiment of the present invention.
Description of reference numerals：
1 view finder
2 objective lens
3 eyepiece groups
4 viewing optical systems
5 light path segmental members
6 display members
7 object lens groups
100 cameras
102 fuselages
103 operation buttons
104 zoom levers
105 shutter release buttons
106 monitors
EP viewpoint
The first lens of Lb1
The second lens of Lb2
The 3rd lens of Lb3
La1～La4, Lc1～Lc3 lens
Z optical axis
Specific embodiment
Hereinafter, embodiments of the present invention are described in detail with reference to the attached drawings.Fig. 1 is illustrated involved by one embodiment of the present invention
And view finder structure.Configuration example shown in Fig. 1 is corresponding with embodiment described later 1.In FIG, the left side of paper is thing side,
Right side is viewpoint side.
View finder 1 shown in Fig. 1 is that possess from thing side towards viewpoint side successively along optical axis Z configuration, with negative power
Objective lens 2, the view finder of the inverse Galilean type of eyepiece group 3 with positive light coke.From objective lens 2 to eyepiece group 3
Optical system constitutes viewing optical system 4.The observation picture formed by viewing optical system 4 is observed in viewpoint EP.Need
Bright, Fig. 1 is shown between objective lens 2 and eyepiece group 3 and is configured with the example without the light path segmental member 5 of focal power.
So, the component that viewing optical system 4 can also be by objective lens 2, not with focal power and eyepiece group 3 are constituted.Or, see
Examine optical system 4 to be made up of objective lens 2 and eyepiece group 3.
Objective lens 2 and eyepiece group 3 are configured to, in the lens separation in terms of air characteristic chamber length in viewing optical system 4
Among, separating objective lens 2 becomes most long with the lens separation of eyepiece group 3.It should be noted that said here " changed with air
The lens separation of calculation length gauge " is the interval in terms of air characteristic chamber length of lens adjacent in the direction of the optical axis and lens,
In the case of the component without focal power is configured between lens and lens, the component is scaled air and is processed.
The objective lens 2 of Fig. 1 are made up of this three lens of lens La1, lens La2 and lens La3 from thing side successively.
But, as shown in embodiment as be described hereinafter, objective lens 2 can also be made up of the lens of the piece number different from the example of Fig. 1.
Eyepiece group 3 is configured to, successively by the first lens Lb1 with negative power from thing side, with positive light coke
Second lens Lb2 and the 3rd lens Lb3 with negative power are constituted, when diopter is adjusted, the first lens Lb1 and the
Three lens Lb3 are fixed, and the second lens Lb2 is moved along optical axis direction.That is, the view finder 1 is configured to when diopter is adjusted only mesh
The lens movement of a part for microscope group 3, the second lens Lb2 function as diopter adjustment lens.
By constituting the eyepiece group 3 with positive light coke in the above described manner, the second lens as positive lens can be strengthened
The focal power of Lb2.And, diopter adjustment is carried out by making second lens Lb2 movement, can suppress and diopter adjustment amount phase
The amount of movement that answers.In addition, negative, positive, negative by making the symbol of the power of lens of composition eyepiece group 3 be set to from thing side successively
Put in order, it can be ensured that the air characteristic chamber length between objective lens 2 and eyepiece group 3 with avoid with objective lens 2 and eyepiece
Interference between the speculum that configures between group 3, prism etc., and the size that can suppress on the external diameter direction of optical system.
Be set to bear, negative, positive put in order, become not in terms of the air characteristic chamber length between objective lens 2 and eyepiece group 3 is guaranteed
Profit, if being set to positive and negative, negative putting in order, becomes unfavorable in terms of the size on the external diameter direction of suppression optical system.Cause
This, in the view finder 1 of present embodiment, becomes while the diopter adjustment amount of size of appropriateness is guaranteed and is conducive to miniaturization
Structure.
More specifically, the first lens Lb1 is preferably shape of the concave surface towards viewpoint side, in this case, image planes
The correction of bending becomes easy.Second lens Lb2 is in order to ensure high light focal power it is preferred that adopt biconvex lens.Better in order to obtain
Good optical property, the 3rd lens Lb3 can also be non-spherical lens.
It should be noted that the view finder 1 possess outside the light path of viewing optical system 4 different from viewing optical system 4
Optical system, as shown in the example of fig. 1, it is also possible to possess the optical systems that this is different between objective lens 2 and eyepiece group 3
Light path and viewing optical system 4 light path synthesis light path segmental member 5.As light path segmental member 5, for example, can also make
With the light path segmental member including being divided into incident light including the semi-transmissive component of transmitted light and reflected light, specifically
Say, half prism, half-reflecting mirror etc. can be enumerated.
Fig. 1 be shown as light path segmental member 5 and use internally have semi-transmissive film half prism, as other
Optical system and possess the example of object lens group 7.In the side contrary with light path segmental member 5 of object lens group 7
Display member 6 is configured with light path.Display member 6 for example shows visual field frame, various information.Object lens group 7 will be from display
The light directing light path segmental member 5, eyepiece group 3 of component 6, by object lens group 7, light path segmental member 5, eyepiece group 3 constituting
Display optical system.According to such structure, can on the observation picture of viewing optical system 4 overlapped view frame, information and enter
Row shows.
Object lens group 7 is preferably had the lens of positive light coke, a piece of lens with negative power and constitutes by two panels.?
Under such circumstances, in the lens combination for combining object lens group 7 and eyepiece group 3, negative lens is become with the piece number of positive lens
For same number, the correction of each aberration in object lens group 7 becomes easy.The object lens group 7 of the example of Fig. 1 is from display structure
Part side is made up of positive lens Lc1, negative lens Lc2 and positive lens Lc3 successively.Object lens group 7 can also adopt with
The different lens arrangement of the example of Fig. 1, for example, it is also possible to be configured to from display member side successively by negative lens, positive lens, just saturating
Mirror is constituted.
View finder 1 preferably meets following conditionals (1)：
0.05 ＜ fN/f3 ＜ 0.5 (1)
Wherein,
fN：The focal length of objective lens；
f3：The focal length of the 3rd lens.
Conditional (1) defines burnt as the objective lens 2 of negative lens group and the light of the 3rd eyepiece group 3 negative lens Lb3
The ratio of degree.By avoiding becoming below the lower limit of conditional (1), it can be ensured that the focal power of the 3rd lens Lb3, spherical aberration
Correction becomes easy.By avoiding becoming more than the upper limit of conditional (1), the focal power of the 3rd lens Lb3 can be suppressed to become
Too strong, being prevented from spherical aberration becomes overcorrect and is modified well.
In order to the effect related to conditional (1) is improved, following conditionals (1-1) are more preferably met, further preferably full
Foot states conditional (1-2)：
0.1 ＜ fN/f3 ＜ 0.4 (1-1)
0.15 ＜ fN/f3 ＜ 0.36 (1-2)
In addition, view finder 1 preferably meets following conditionals (2)：
0.55 ＜ D/f2 ＜ 1.5 (2)
Wherein,
D：From objective lens most by viewpoint side lens face to eyepiece group most by thing side lens face air change
Calculate length；
f2：The focal length of the second lens.
Conditional (2) defines the air characteristic chamber length at the interval of objective lens 2 and eyepiece group 3 and the second positive lens Lb2
Focal length ratio.By avoiding becoming below the lower limit of conditional (2), it can be ensured that second as diopter adjustment lens is saturating
The focal power of mirror Lb2, due to reducing the amount of movement of second lens Lb2 corresponding with diopter adjustment amount, is therefore not result in
The maximization of device and make diopter adjustment space guarantee become easy.By avoid becoming the upper limit of conditional (2) with
On, the focal power of the second lens Lb2 can be suppressed to become too strong, aberration when easily suppression diopter is adjusted changes.
In order to the effect related to conditional (2) is improved, following conditionals (2-1) are more preferably met：
0.6 ＜ D/f2 ＜ 1 (2-1)
In addition, view finder 1 preferably meets following conditionals (3)：
0.1 ＜ m fl/f3 ＜ 0.8 (3)
Wherein,
m：Diopter be -1 diopter in the state of viewing optical system angular magnification；
fl：The focal length of the first lens；
f3：The focal length of the 3rd lens.
Conditional (3) is defined and is multiplied by observation to the first lens Lb1 for bearing with the ratio of the focal power of the 3rd negative lens Lb3
Product after the angular magnification of optical system 4.By avoiding becoming below the lower limit of conditional (3), being capable of rejection ratio the second lens Lb2
Power of lens by thing side become too strong, easily to be produced to revise using the second lens Lb2 and the 3rd lens Lb3
Aberration.By avoiding becoming more than the upper limit of conditional (3), the focal power of the 3rd lens Lb3 can be suppressed to become too strong, easily
Aberration to be occurred is revised using the lens beyond the 3rd lens Lb3.
In order to the effect related to conditional (3) is improved, following conditionals (3-1) are more preferably met：
0.15 ＜ m f1/f3 ＜ 0.6 (3-1)
Preferred structure described above, possible structure also include the structure related to conditional, can be combined, excellent
According to required specification, properly selecting property is adopted for choosing.For example, by suitably adopting said structure, can realize having concurrently
The miniaturization of mirror system and the view finder of larger diopter adjustment amount." larger diopter adjustment amount " said here is referred to, -3
The dioptric scope in diopter～+1.5 or wide range.
Next, the numerical example to the view finder of the present invention is illustrated.The taking of embodiment 1～4 described below
Scape device configures light path segmental member 5 between objective lens 2 and eyepiece group 3, and with viewing optical system, display optical system.
[embodiment 1]
Embodiment 1 be suitable to constitute with 35mm convert when photographic lens of the focal length as 50mm or so the angle of visual field corresponding take
The situation of scape device.Fig. 2 illustrates the sectional view of the viewing optical system of the view finder of embodiment 1, and Fig. 3 illustrates display optical system
Sectional view.
Viewing optical system shown in Fig. 2 is from thing side towards viewpoint side successively by the objective lens 2, conduct with negative power
The prism of light path segmental member 5 and the eyepiece group with positive light coke 3 are constituted.Objective lens 2 are successively by positive saturating from thing side
Mirror La1, negative lens La2 and negative lens La3 are constituted.Eyepiece group 3 successively by the first negative lens Lb1 from thing side, just
The second lens Lb2 and the 3rd negative lens Lb3 constitute.When diopter is adjusted, only the second lens Lb2 is moved along optical axis direction
Dynamic.
Display optical system shown in Fig. 3 from display member 6 to viewpoint side successively by display member 6, object lens group 7,
Prism as light path segmental member 5 and the eyepiece group with positive light coke 3 are constituted.Object lens group 7 is from display member side
It is made up of positive lens Lc1, negative lens Lc2 and positive lens Lc3 successively.Implement the half of light path synthesis in the prism
Transmission film, synthesizes light path and the observation optics of the object lens group 7 configured outside the light path of viewing optical system using prism
The light path of system.Thus, viewing optical system observation as the interior display for overlapping with display member 6.Though it should be noted that
So the light path of display optical system becomes bending light path as shown in Figure 1, but in order to make it easy to understand, Fig. 3 is illustrated light path exhibition
Figure after opening.
Table 1 illustrates the basic lens data of viewing optical system, variable face interval, the various factors with regard to d line, and table 2 shows
Go out asphericity coefficient.Mono- hurdle of Si of basic lens data is illustrated so that the face most by the thing side of the inscape of thing side is set to first
Individual and in the case of numbering to the face of inscape mark face with the mode for increasing towards viewpoint side successively i-th (i=1,
2,3 ...) face numbering, mono- hurdle of Ri illustrate the radius of curvature in i-th face, and mono- hurdle of Di illustrates i-th face with i+1 face in optical axis Z
On face interval, mono- hurdle of Ndj illustrate the inscape most by thing side be set to first and with increasing towards viewpoint side successively
J-th (j=1,2,3 ...) inscape the refractive index with regard to d line (wavelength 587.6nm), mono- hurdle of vdj illustrates j-th structure
Become the Abbe number of the d line benchmark of key element.
Here, with regard to the symbol of radius of curvature, the radius of curvature of the face shape convex surface facing thing side is just set to, by convex surface
It is set to bear towards the radius of curvature of the face shape of viewpoint side.In basic lens data, the semi-transmissive film in prism also serves as one
Face illustrates.The value for most descending hurdle of Di is the interval between the lens face most by viewpoint side of eyepiece group 3 and viewpoint EP.In addition,
In basic lens data, with regard to the variable face interval changed when diopter is adjusted, should using mark in the such mark of DD [], []
The face of the thing side at interval is numbered and charges to mono- hurdle of Di.Each variable face interval under each diopter is shown in the table at variable face interval.Can
The dpt of the table at change face interval represents diopter.The unit in the apparent visual field of the table of various factors is degree.
In basic lens data, * mark is labeled with to aspheric face numbering, in one hurdle of aspheric radius of curvature
Describe the numerical value of paraxial radius of curvature.Each aspheric asphericity coefficient is shown in table 2.The number of the asphericity coefficient of table 2
" E-n " (n of value：Integer) represent " × 10-n”.Asphericity coefficient is each COEFFICIENT K A, Am in the aspherical formula being expressed from the next
(m=3,4,5 ... 16, or, m=4,6,8 ... 18) value.
[formula 1]
Wherein,
Zd：Aspherical depth (from height h aspherical on the plane vertical with optical axis that connect to aspheric vertex of surface of point
The length of the vertical line of extraction)；
h：Highly (distance from optical axis to lens face)；
C：Paraxial curvature；
KA, Am (m=3,4,5 ... 16, or, m=4,6,8 ... 18)：Asphericity coefficient.
In the data of each table, the unit degree of use of angle, the unit of length use mm.In addition, shown below each
The numerical value after rounding with regulation digit is recorded in table.
[table 1]
1 viewing optical system of embodiment
Basic lens data
| Si | Ri | Di | Ndj | vdj |
| 1 | 16.2350 | 2.7900 | 1.91082 | 35.25 |
| 2 | 26.9147 | 2.2257 | ||
| 3 | 37.3522 | 0.7500 | 1.81600 | 46.62 |
| 4 | 8.4129 | 3.0591 | ||
| * 5 | -27.1686 | 0.9000 | 1.80462 | 40.77 |
| * 6 | 348.8534 | 2.1892 | ||
| 7 | ∞ | 5.7000 | 1.85150 | 40.78 |
| 8 | ∞ | 5.7000 | 1.85150 | 40.78 |
| 9 | ∞ | 0.1000 | ||
| 10 | 30.2836 | 0.8000 | 1.90366 | 31.31 |
| 11 | 17.1164 | DD[11] | ||
| 12 | 14.6078 | 3.3800 | 1.88300 | 40.76 |
| 13 | -48.7245 | DD[13] | ||
| * 14 | 40.6872 | 1.0000 | 1.68400 | 31.30 |
| * 15 | 18.7611 | 13.8413 |
Variable face interval
| Diopter | -1.0dpt | +2.0dpt | -4.0dpt |
| DD[11] | 1.3313 | 2.1817 | 0.5317 |
| DD[13] | 1.4779 | 0.6275 | 2.2775 |
Various factors
| Angular magnification | 0.595 |
| The apparent visual field | 29.2 |
[table 2]
1 viewing optical system of embodiment
Asphericity coefficient
| Face is numbered | 5 | 6 |
| KA | 3.1468467E-01 | -4.9979999E+00 |
| A3 | 0.0000000E+00 | 0.0000000E+00 |
| A4 | 2.0402403E-03 | 1.5198291E-03 |
| A5 | -1.5660358E-04 | 1.8972030E-04 |
| A6 | -5.8151172E-05 | -2.2080544E-04 |
| A7 | -4.9308257E-05 | 2.9203453E-05 |
| A8 | 2.6146767E-05 | -8.5243190E-06 |
| A9 | -4.4375384E-06 | 5.0776942E-06 |
| A10 | 2.6652010E-07 | -9.3767813E-07 |
| A11 | 2.2379409E-08 | 3.1920514E-09 |
| A12 | -3.1146059E-09 | 1.8896795E-08 |
| A13 | -1.1900030E-09 | -2.5908547E-09 |
| A14 | 3.3810099E-10 | 1.4991103E-10 |
| A15 | -3.1998496E-11 | -1.7533672E-12 |
| A16 | 1.0759893E-12 | -1.6260314E-13 |
| Face is numbered | 14 | 15 |
| KA | 8.6368139E-01 | 1.2015365E+00 |
| A4 | -5.3696590E-07 | 8.7628554E-05 |
| A6 | -4.2140008E-07 | 4.2717282E-07 |
| A8 | 1.9049099E-08 | -5.5860605E-08 |
| A10 | 5.2874523E-10 | 6.1771113E-10 |
| A12 | 1.8003018E-11 | 2.8037465E-10 |
| A14 | 2.4642133E-13 | 1.1214600E-12 |
| A16 | -1.1639331E-14 | -3.3762480E-13 |
| A18 | -6.0123325E-16 | 2.0922875E-15 |
Equally, table 3 illustrate display optical system basic lens data, with regard to d line various factors, table 4 illustrates aspheric
Face coefficient.In the table of basic lens data, the face of thing side of the inscape of display member side is most leaned on as first
And the face mark face numbering with the mode for increasing towards viewpoint side successively to inscape.The focal length of the table of various factors is aobvious
Show the focal length of optical system.
[table 3]
1 display optical system of embodiment
Basic lens data
| Si | Ri | Di | Ndj | vdj |
| 1 | ∞ | 3.4150 | 1.49023 | 57.49 |
| 2 | ∞ | 2.4000 | ||
| 3 | ∞ | 2.6800 | 1.68893 | 31.07 |
| 4 | -18.5174 | 2.8918 | ||
| 5 | -9.1948 | 0.9000 | 1.89286 | 20.36 |
| 6 | ∞ | 1.2056 | ||
| 7 | -15.8632 | 2.9500 | 1.77250 | 49.60 |
| 8 | -9.5542 | 0.1000 | ||
| 9 | ∞ | 7.2000 | 1.85150 | 40.78 |
| 10 | ∞ | 5.7000 | 1.85150 | 40.78 |
| 11 | ∞ | 0.1000 | ||
| 12 | 30.2836 | 0.8000 | 1.90366 | 31.31 |
| 13 | 17.1164 | DD[11] | ||
| 14 | 14.6078 | 3.3800 | 1.88300 | 40.76 |
| 15 | -48.7245 | DD[13] | ||
| * 16 | 40.6872 | 1.0000 | 1.68400 | 31.30 |
| * 17 | 18.7611 | 13.8413 |
Various factors
| Focal length | 23.15 |
| The apparent visual field | 31.2 |
[table 4]
1 display optical system of embodiment
Asphericity coefficient
| Face is numbered | 16 | 17 |
| KA | 8.6368139E-01 | 1.2015365E+00 |
| A4 | -5.3696590E-07 | 8.7628554E-05 |
| A6 | -4.2140008E-07 | 4.2717282E-07 |
| A8 | 1.9049099E-08 | -5.5860605E-08 |
| A10 | 5.2874523E-10 | 6.1771113E-10 |
| A12 | 1.8003018E-11 | 2.8037465E-10 |
| A14 | 2.4642133E-13 | 1.1214600E-12 |
| A16 | -1.1639331E-14 | -3.3762480E-13 |
| A18 | -6.0123325E-16 | 2.0922875E-15 |
Fig. 9 be illustrate diopter be -1 diopter in the state of embodiment 1 viewing optical system each aberration diagram.Fig. 9
From illustrate successively from left to right spherical aberration, astigmatism, distort aberration (distortion), ratio chromatism, (aberration of multiplying power).In spherical aberration diagram
In, illustrated with regard to d line (wavelength 587.6nm), C line (wavelength 656.3nm), F line (wavelength with solid line, long dotted line, short dash line respectively
486.1nm) aberration.In astigmatism in figure, respectively radial direction, the tangential aberration with regard to d line are illustrated with solid line, short dash line.Askew
The aberration being shown in solid in bent aberration diagram with regard to d line.In ratio chromatism, in figure, illustrated with regard to C with long dotted line, short dash line respectively
Line, the aberration of F line.Spherical aberration diagramRefer to that a diameter of 7.0mm of viewpoint, the ω of other aberration diagrams refer to table
See the angle of half field-of view in the visual field.The unit of the transverse axis of spherical aberration diagram and astigmatism figure is diopter, the list of the transverse axis of ratio chromatism, figure
Position is the amount of angle.
As long as the mark of each data described in the explanation of the above embodiments 1, implication, record method are not illustrated
Also identical in the examples below, therefore, repeat specification omitted below.
[embodiment 2]
In embodiment 2, be suitable to constitute with 35mm convert when photographic lens of the focal length as 28mm or so the angle of visual field corresponding
View finder situation.Embodiment 2 is the light that the positive lens La1 of the objective lens 2 for making embodiment 1 retreats to viewing optical system
Extract out to thing side outside road and by remaining two panels negative lens La2, La3, the optical system thus to embodiment 1 implements zoom
Optical system.Fig. 4 illustrates the sectional view of the viewing optical system of the view finder of embodiment 2.The display optical system of embodiment 2 with
The display optical system of embodiment 1 is identical, therefore the record of the data of the display optical system of embodiment 2, drawing is omitted.
Viewing optical system shown in Fig. 4 is from thing side towards viewpoint side successively by the objective lens 2, conduct with negative power
The prism of light path segmental member 5 and the eyepiece group with positive light coke 3 are constituted.Objective lens 2 are successively by negative saturating from thing side
Mirror La2, negative lens La3 are constituted.Eyepiece group 3 from thing side successively by the first negative lens Lb1, the second positive lens Lb2, with
And the 3rd negative lens Lb3 is constituted.When diopter is adjusted, only the second lens Lb2 is moved along optical axis direction.
Table 5 illustrates the basic lens data of viewing optical system, variable face interval, the various factors with regard to d line, and table 6 shows
Go out asphericity coefficient.Figure 10 illustrate diopter be -1 diopter in the state of viewing optical system each aberration diagram.
[table 5]
2 viewing optical system of embodiment
Basic lens data
| Si | Ri | Di | Ndj | vdj |
| 1 | 37.3522 | 0.7500 | 1.81600 | 46.62 |
| 2 | 8.4129 | 3.0591 | ||
| * 3 | -27.1686 | 0.9000 | 1.80462 | 40.77 |
| * 4 | 348.8534 | 5.2333 | ||
| 5 | ∞ | 5.7000 | 1.85150 | 40.78 |
| 6 | ∞ | 5.7000 | 1.85150 | 40.78 |
| 7 | ∞ | 0.1000 | ||
| 8 | 30.2836 | 0.8000 | 1.90366 | 31.31 |
| 9 | 17.1164 | DD[11] | ||
| 10 | 14.6078 | 3.3800 | 1.88300 | 40.76 |
| 11 | -48.7245 | DD[13] | ||
| * 12 | 40.6872 | 1.0000 | 1.68400 | 31.30 |
| * 13 | 18.7611 | 13.8413 |
Variable face interval
| Diopter | -1.0dpt | +2.0dpt | -4.0dpt |
| DD[11] | 1.4103 | 2.2644 | 0.6080 |
| DD[13] | 1.3989 | 0.5448 | 2.2012 |
Various factors
| Angular magnification | 0.361 |
| The apparent visual field | 28.5 |
[table 6]
2 viewing optical system of embodiment
Asphericity coefficient
| Face is numbered | 3 | 4 |
| KA | 3.1468467E-01 | -4.9979999E+00 |
| A3 | 0.0000000E+00 | 0.0000000E+00 |
| A4 | 2.0402403E-03 | 1.5198291E-03 |
| A5 | -1.5660358E-04 | 1.8972030E-04 |
| A6 | -5.8151172E-05 | -2.2080544E-04 |
| A7 | -4.9308257E-05 | 2.9203453E-05 |
| A8 | 2.6146767E-05 | -8.5243190E-06 |
| A9 | -4.4375384E-06 | 5.0776942E-06 |
| A10 | 2.6652010E-07 | -9.3767813E-07 |
| A11 | 2.2379409E-08 | 3.1920514E-09 |
| A12 | -3.1146059E-09 | 1.8896795E-08 |
| A13 | -1.1900030E-09 | -2.5908547E-09 |
| A14 | 3.3810099E-10 | 1.4991103E-10 |
| A15 | -3.1998496E-11 | -1.7533672E-12 |
| A16 | 1.0759893E-12 | -1.6260314E-13 |
| Face is numbered | 12 | 13 |
| KA | 8.6368139E-01 | 1.2015365E+00 |
| A4 | -5.3696590E-07 | 8.7628554E-05 |
| A6 | -4.2140008E-07 | 4.2717282E-07 |
| A8 | 1.9049099E-08 | -5.5860605E-08 |
| A10 | 5.2874523E-10 | 6.1771113E-10 |
| A12 | 1.8003018E-11 | 2.8037465E-10 |
| A14 | 2.4642133E-13 | 1.1214600E-12 |
| A16 | -1.1639331E-14 | -3.3762480E-13 |
| A18 | -6.0123325E-16 | 2.0922875E-15 |
[embodiment 3]
Embodiment 3 be suitable to constitute with 35mm convert when photographic lens of the focal length as 21mm or so the angle of visual field corresponding take
The situation of scape device.Fig. 5 illustrates the sectional view of the viewing optical system of the view finder of embodiment 3, and Fig. 6 illustrates display optical system
Sectional view.
Viewing optical system shown in Fig. 5 is from thing side towards viewpoint side successively by the objective lens 2, conduct with negative power
The prism of light path segmental member 5 and the eyepiece group with positive light coke 3 are constituted.Objective lens 2 are successively by negative saturating from thing side
Mirror La1, negative lens La2, positive lens La3, negative lens La4 are constituted.Eyepiece group 3 is saturating by negative first successively from thing side
Mirror Lb1, the second positive lens Lb2 and the 3rd negative lens Lb3 are constituted.When diopter is adjusted, only the second lens Lb2 is along light
Direction of principal axis is moved.
Display optical system shown in Fig. 6 from display member 6 to viewpoint side successively by display member 6, object lens group 7,
Prism as light path segmental member 5 and the eyepiece group with positive light coke 3 are constituted.Object lens group 7 is from display member side
It is made up of negative lens Lc1, positive lens Lc2, positive lens Lc3 successively.Implement the half transmitting of light path synthesis in the prism
Film, synthesizes light path and the viewing optical system of the object lens group 7 configured outside the light path of viewing optical system using prism
Light path, observation as the interior display for overlapping with display member 6.
Table 7 illustrates the basic lens data of viewing optical system, variable face interval, the various factors with regard to d line.Table 8 shows
Go out display optical system basic lens data, with regard to d line various factors.Figure 11 illustrates diopter in the state of -1 diopter
Viewing optical system each aberration diagram.
[table 7]
3 viewing optical system of embodiment
Basic lens data
| Si | Ri | Di | Ndj | vdj |
| 1 | 26.0188 | 0.9000 | 2.00100 | 29.13 |
| 2 | 13.1400 | 3.7669 | ||
| 3 | 39.9797 | 0.7500 | 1.88100 | 40.14 |
| 4 | 17.6349 | 2.5050 | ||
| 5 | 131.4932 | 2.9329 | 1.95906 | 17.47 |
| 6 | -34.9003 | 0.1000 | ||
| 7 | 136.6860 | 0.7000 | 1.88300 | 40.76 |
| 8 | 14.2946 | 3.9690 | ||
| 9 | ∞ | 7.5000 | 1.51680 | 64.20 |
| 10 | ∞ | 7.5000 | 1.51680 | 64.20 |
| 11 | ∞ | 0.1000 | ||
| 12 | ∞ | 0.7000 | 2.00100 | 29.13 |
| 13 | 37.9841 | DD[13] | ||
| 14 | 29.4408 | 4.2222 | 1.83481 | 42.72 |
| 15 | -20.3689 | DD[14] | ||
| 16 | -18.1947 | 0.7000 | 1.68893 | 31.07 |
| 17 | -34.0388 | 13.1500 |
Variable face interval
| Diopter | -1.0dpt | +2.0dpt | -4.0dpt |
| DD[13] | 1.8751 | 3.1604 | 0.7301 |
| DD[14] | 2.1412 | 0.8559 | 3.2863 |
Various factors
| Angular magnification | 0.302 |
| The apparent visual field | 31.2 |
[table 8]
3 display optical system of embodiment
Basic lens data
| Si | Ri | Di | Ndj | vdj |
| 1 | ∞ | 4.6006 | ||
| 2 | -11.9380 | 0.7000 | 1.95906 | 17.47 |
| 3 | 34.1142 | 0.5387 | ||
| 4 | 119.6399 | 3.6145 | 1.88300 | 40.76 |
| 5 | -15.6548 | 0.1000 | ||
| 6 | -60.9740 | 2.6848 | 1.81600 | 46.62 |
| 7 | -17.9857 | 0.1000 | ||
| 8 | ∞ | 9.0000 | 1.51680 | 64.20 |
| 9 | ∞ | 7.5000 | 1.51680 | 64.20 |
| 10 | ∞ | 0.1000 | ||
| 11 | ∞ | 0.7000 | 2.00100 | 29.13 |
| 12 | 37.9841 | DD[13] | ||
| 13 | 29.4408 | 4.2222 | 1.83481 | 42.72 |
| 14 | -20.3689 | DD[14] | ||
| 15 | -18.1947 | 0.7000 | 1.68893 | 31.07 |
| 16 | -34.0388 | 13.1500 |
Various factors
| Focal length | 20.85 |
| The apparent visual field | 34.9 |
[embodiment 4]
Embodiment 4 be suitable to constitute with 35mm convert when photographic lens of the focal length as 60mm or so the angle of visual field corresponding take
The situation of scape device.Fig. 7 illustrates the sectional view of the viewing optical system of the view finder of embodiment 4, and Fig. 8 illustrates display optical system
Sectional view.
Viewing optical system shown in Fig. 7 is from thing side towards viewpoint side successively by the objective lens 2, conduct with negative power
The prism of light path segmental member 5 and the eyepiece group with positive light coke 3 are constituted.Objective lens 2 are successively by positive saturating from thing side
Mirror La1, negative lens La2 are constituted.Eyepiece group 3 from thing side successively by the first negative lens Lb1, the second positive lens Lb2, with
And the 3rd negative lens Lb3 is constituted.When diopter is adjusted, only the second lens Lb2 is moved along optical axis direction.
Display optical system shown in Fig. 8 from display member 6 to viewpoint side successively by display member 6, object lens group 7,
Prism as light path segmental member 5 and the eyepiece group with positive light coke 3 are constituted.Object lens group 7 is from display member side
It is made up of negative lens Lc1, positive lens Lc2, positive lens Lc3 successively.Implement the half transmitting of light path synthesis in the prism
Film, synthesizes light path and the viewing optical system of the object lens group 7 configured outside the light path of viewing optical system using prism
Light path, observation as the interior display for overlapping with display member 6.
Table 9 illustrates the basic lens data of viewing optical system, variable face interval, the various factors with regard to d line.Table 10 shows
Go out display optical system basic lens data, with regard to d line various factors.Figure 12 illustrates diopter in the state of -1 diopter
Viewing optical system each aberration diagram.
[table 9]
4 viewing optical system of embodiment
Basic lens data
| Si | Ri | Di | Ndj | vdj |
| 1 | 16.5785 | 2.9320 | 2.00272 | 19.32 |
| 2 | 20.9148 | 1.8765 | ||
| 3 | 148.0395 | 0.7000 | 1.91082 | 35.25 |
| 4 | 14.0199 | 2.6344 | ||
| 5 | ∞ | 7.5000 | 1.51680 | 64.20 |
| 6 | ∞ | 7.5000 | 1.51680 | 64.20 |
| 7 | ∞ | 0.1000 | ||
| 8 | 477149.5261 | 0.7000 | 1.92119 | 23.96 |
| 9 | 26.5687 | DD[9] | ||
| 10 | 26.9969 | 3.0611 | 1.88300 | 40.76 |
| 11 | -26.3758 | DD[11] | ||
| 12 | -69.7220 | 0.7000 | 1.54072 | 47.23 |
| 13 | 124.7580 | 13.1500 |
Variable face interval
| Diopter | -1.0dpt | +2.0dpt | -4.0dpt |
| DD[9] | 1.3556 | 2.4587 | 0.3265 |
| DD[11] | 1.4692 | 0.3661 | 2.4982 |
Various factors
| Angular magnification | 0.658 |
| The apparent visual field | 30.7 |
[table 10]
4 viewing optical system of embodiment
Basic lens data
| Si | Ri | Di | Ndj | vdi |
| 1 | ∞ | 6.2586 | ||
| 2 | -9.6098 | 0.7000 | 1.95906 | 17.47 |
| 3 | -640.8158 | 0.8560 | ||
| 4 | -29.7850 | 3.3705 | 1.95375 | 32.32 |
| 5 | -11.7580 | 0.1000 | ||
| 6 | -722.9798 | 2.8199 | 1.83481 | 42.72 |
| 7 | -23.7153 | 0.1000 | ||
| 8 | ∞ | 9.0000 | 1.51680 | 64.20 |
| 9 | ∞ | 7.5000 | 1.51680 | 64.20 |
| 10 | ∞ | 0.1000 | ||
| 11 | 477149.5261 | 0.7000 | 1.92119 | 23.96 |
| 12 | 26.5687 | DD[9] | ||
| 13 | 26.9969 | 3.0611 | 1.88300 | 40.76 |
| 14 | -26.3758 | DD[11] | ||
| 15 | -69.7220 | 0.7000 | 1.54072 | 47.23 |
| 16 | 124.7580 | 13.1500 |
Various factors
| Focal length | 21.48 |
| The apparent visual field | 33.9 |
Table 11 illustrates the respective value of conditional (1)～(3) of the view finder of embodiment 1～4.Value shown in table 11 be with d
Value on the basis of line.
[table 11]
| Formula is numbered | Embodiment 1 | Embodiment 2 | Embodiment 3 | Embodiment 4 | |
| (1) | fN/f3 | 0.280 | 0.170 | 0.178 | 0.351 |
| (2) | D/f2 | 0.647 | 0.880 | 0.931 | 0.813 |
| (3) | m·f1/f3 | 0.515 | 0.313 | 0.198 | 0.230 |
From above data, the view finder of embodiment 1～4 can be real in the dioptric scope in -4 diopter～+2
Existing diopter adjustment, in the amount of movement of the diopter adjustment lens carried out from -4 diopters to+2 diopters when diopter is adjusted be
Below 2.44mm, it is suppressed that the amount of movement of lens corresponding with diopter adjustment amount and becoming is conducive to the structure for minimizing.In addition,
The view finder of embodiment 1～4 have modified each aberration well and realize good optical property.
Next, the camera head to embodiments of the present invention is illustrated.Figure 13 is the shooting dress for illustrating the present invention
The stereogram of the Sketch of the rear side of the camera 100 involved by an embodiment that puts.Camera 100 is upper fuselage 102
Portion possesses the view finder 1 involved by embodiments of the present invention.Camera 100 possesses various for carrying out at the back side of fuselage 102
The operation button 103 of setting, for carrying out the zoom lever 104, display image of zoom and the monitor 106 of various setting screens,
And possess shutter release button 105 in the upper surface of fuselage 102.In camera 100, the shooting by the front for being disposed in fuselage 102 is saturating
The picture of the object that mirror (not shown) is obtained is formed at the imaging surface of imaging apparatus (not shown).User is from rear side by taking
Scape device 1 is observing the view finder picture of object.It should be noted that, although Figure 13 illustrates the view finder that is built in camera 100
Example, but the present invention can also be applied to peripheral hardware view finder.In addition, the camera head of the present invention is not limited to shown in Figure 13
Example, for example, can also apply the present invention to video camera etc..
More than, enumerate embodiment and embodiment illustrate the present invention, but the invention is not restricted to above-mentioned embodiment with
And embodiment, various modifications can be carried out.For example, the radius of curvature of each lens, face interval, refractive index, Abbe number, aspherical system
Number etc. is not limited to the value exemplified by above-mentioned each Numerical implementation, it is also possible to adopt other values.
Claims (11)
1. a kind of view finder, is the view finder of inverse Galilean type, and which possesses with negative power from thing side successively towards viewpoint side
Objective lens and the eyepiece group with positive light coke, it is characterised in that
Between the lens in terms of air characteristic chamber length in the viewing optical system from the objective lens to the eyepiece group
Every among, it is most long with the lens separation of the eyepiece group to separate the objective lens,
The eyepiece group from thing side successively by the first lens with negative power, the second lens with positive light coke, with
And the 3rd lens with negative power are constituted,
When diopter is adjusted, first lens and the 3rd lens are fixed, and second lens are moved along optical axis direction
Dynamic.
2. view finder according to claim 1, wherein,
The view finder meets following conditionals (1)：
0.05 ＜ fN/f3 ＜ 0.5 (1)
Wherein,
fN：The focal length of the objective lens；
f3：The focal length of the 3rd lens.
3. view finder according to claim 1 and 2, wherein,
The view finder meets following conditionals (2)：
0.55 ＜ D/f2 ＜ 1.5 (2)
Wherein,
D：From the objective lens most by viewpoint side lens face to the eyepiece group most by thing side lens face sky
Gas characteristic chamber length；
f2：The focal length of second lens.
4. view finder according to claim 1 and 2, wherein,
The view finder meets following conditionals (3)：
0.1 ＜ m f1/f3 ＜ 0.8 (3)
Wherein,
m：Diopter be -1 diopter in the state of the viewing optical system angular magnification；
f1：The focal length of first lens；
f3：The focal length of the 3rd lens.
5. view finder according to claim 1 and 2, wherein,
Outside the light path of the viewing optical system, possess the optical systems different from the viewing optical system,
Between the objective lens and the eyepiece group, possess the light path of the different optical system and the observation optics
The light path segmental member of the light path synthesis of system.
6. view finder according to claim 5, wherein,
The different optical system is had the lens of positive light coke by two panels and a piece of lens with negative power are constituted.
7. view finder according to claim 2, wherein,
The view finder meets following conditionals (1-1)：
0.1 ＜ fN/f3 ＜ 0.4 (1-1).
8. view finder according to claim 2, wherein,
The view finder meets following conditionals (1-2)：
0.15 ＜ fN/f3 ＜ 0.36 (1-2).
9. view finder according to claim 3, wherein,
The view finder meets following conditionals (2-1)：
0.6 ＜ D/f2 ＜ 1 (2-1).
10. view finder according to claim 4, wherein,
The view finder meets following conditionals (3-1)：
0.15 ＜ m f1/f3 ＜ 0.6 (3-1).
A kind of 11. camera heads, wherein,
The camera head possesses the view finder any one of claim 1 to 10.
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| JP2015165367A JP6363570B2 (en) | 2015-08-25 | 2015-08-25 | Viewfinder and imaging device |
| JP2015-165367 | 2015-08-25 |
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| TWI585455B (en) | 2015-10-20 | 2017-06-01 | 大立光電股份有限公司 | Image capturing lens system, image capturing apparatus and electronic device |
| TWI656377B (en) | 2018-03-28 | 2019-04-11 | 大立光電股份有限公司 | Image taking optical lens, image taking device and electronic device |
| JP7229853B2 (en) | 2019-05-29 | 2023-02-28 | 富士フイルム株式会社 | viewfinder and imaging device |
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Also Published As
| Publication number | Publication date |
|---|---|
| US9798121B2 (en) | 2017-10-24 |
| US20170059833A1 (en) | 2017-03-02 |
| JP6363570B2 (en) | 2018-07-25 |
| JP2017044764A (en) | 2017-03-02 |
| CN106483652B (en) | 2020-06-16 |
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